--- a/src/eric7/Graphics/PackageDiagramBuilder.py	Wed Nov 16 18:11:52 2022 +0100
+++ b/src/eric7/Graphics/PackageDiagramBuilder.py	Thu Nov 17 18:11:42 2022 +0100
@@ -49,7 +49,7 @@
 
         self.__relPackage = (
             self.project.getRelativePath(self.package)
-            if self.project.isProjectSource(self.package)
+            if self.project.isProjectCategory(self.package, "SOURCES")
             else ""
         )